The First Data Release of CNIa0.02 -- A Complete Nearby (Redshift <0.02) Sample of Type Ia Supernova Light Curves

TL;DR

This paper presents the first data release of a complete, volume-limited sample of 247 nearby Type Ia supernovae light curves, aiming to study their properties and explosion physics in an unbiased manner.

Contribution

It provides a comprehensive, unbiased dataset of 247 SNe Ia light curves, including 148 in the complete sample, enabling detailed statistical analysis of local supernova properties.

Findings

Light curves for 247 SNe Ia are presented.

Parameters like peak fluxes, dm15, and s_BV are derived.

Sample is unbiased and volume-limited within z<0.02.

Abstract

The CNIa0.02 project aims to collect a complete, nearby sample of Type Ia supernovae (SNe Ia) light curves, and the SNe are volume-limited with host-galaxy redshifts z_host < 0.02. The main scientific goal is to infer the distributions of key properties (e.g., the luminosity function) of local SNe Ia in a complete and unbiased fashion in order to study SN explosion physics. We spectroscopically classify any SN candidate detected by the All-Sky Automated Survey for Supernovae (ASAS-SN) that reaches peak brightness < 16.5 mag. Since ASAS-SN scans the full sky and does not target specific galaxies, our target selection is effectively unbiased by host-galaxy properties. We perform multi-band photometric observations starting from the time of discovery. In the first data release (DR1), we present the optical light curves obtained for 247 SNe from our project (including 148 SNe in the complete sample), and we derive parameters such as the peak fluxes, dm15 and s_BV.